Car-door lock.



W. A. BYRNE & J. WISE. 1

OAR DOOR LOOK.

APPLIGATION FILED AUG. 20, 190B.

Patented Mar; 14, 1911.

UNITED STATES PATENT oEEToE.

WALTER A. BYRNE AND JAMES WISE, OF AUBURN, NEW YORK, ASSIGNORS OF ONE- THIRD TO MICHAEL A. OCONNELL AND ONE-FOURTH T0 PATRICK F. MORRISSY,

BOTH 0F AUBURN, NEW YORK.

CAR-DOOR LOCK.

To all whom it may concern:

Be it known that we, WALTER A. BYRNE and JAMES WISE, citizens of the United States residing at Auburn, in the county of Cayuga and State of New York, have in vented certain new and useful Improvements in Car-Door Locks, of which the following is a specification.

Our invention relates to improvements in car door locks.

One object of the invention is the provision of a lock of simple and novel construction wherein thelatch will, upon the closing of the door, automatically engage and se cure the door in closed position.

A further object of our invention is the provision of a car door lock wherein the latch cannot be moved into inactive or door releasing position except by air pressure, such pressure being preferably derived from the auxiliary cylinder of the air brake system of the car to which the lock is applied.

A still further object of our invention is the provision of a car door lock which is provided with an audible signal, the signal being adapted to be automatically sounded upon the admission of air to the lock to move the latch into inactive or door releasing position.

A still further object of our invention is the provision of a car door lock which is simple of construction and positive ofo-peration, which may be manufactured and sold I ata comparatively low cost, and which may be used in connection with any construction of sliding door.

With the above and other objects in view, the invention consists in the construction, combination and arrangement of parts hereinafter fully described and claimed, and llustrated in the accompanying drawing, wherein Figure 1 is a view in side elevation of a car door lock constructed in accordance with our invention, a portion of the lock being in vertical section. Fig. 2 is a sectional view taken on the plane indicated by the line 2-2 of Fig. 1, and Fig. 3 is a view in side elevation illustrating a slightly modified form of the lock.

A designates a fragmentary portion of a freight car of the usual form and construc- Specification of Letters Patent.

Application filed August 20, 1908.

Patented Mar. 14, 1911.

Serial No. 449,478.

tion, and B a fragmentary portion of the door of the car.

The casing of the lock comprises a front wall 2, a top wall 3, a bottom wallet, and end walls 5 and 6, which are preferably formed integrally. The casing also comprises a rear removable wall 7 and is secured in applied position by means of bolts 8 which pass through the front and rear walls 2 and 7 respectively and through the side A of the car. The end wall 5 of the casing is provided with an opening 9 through which projects the hooked end of a latch 10 which is pivotally mounted within the casing by means of an element 11. The latch is yieldingly retained in active or door securing position by means of a spring 12 which is preferably of the leaf type. The spring 12 is secured at one end to the top wall 3 of the casing by v means of an element 13, its free end being disposed for engagement with the latch 10. The tension of the spring 12 may be regulated through the medium of a set screw 14 The keeper preferably comprises a casing which is secured in applied position by means of bolts 17 and has one of its end walls formed to provide an opening 18. The hooked end of the latch 10 passes through the opening 18 for locking engagement with said end Wall of the keeper. The latch is provided with an outer curved edge 19 which is engaged by the keeper when the door is moved into its closed position, the contact between the keeper and said curved end being such that the latch is raised to permit its hooked portion to pass through the opening 18 for interlocking engagement with the keeper. As the spring yieldingly retains the latch in active or door securing posi tion, it should be apparent that the latch will, upon the closing of the door, automatically engage the keeper and secure the door in closed position.

The latch 10 is adapted to be moved into inactive or door releasing position by means of air pressure derived from the auxiliary cylinder of the air brake system of the car.

A vertical pipe is threadedly secured to the bottom wall 4: ofthe casing and the upper end thereof projects into the casing.

The lower end of the pipe 20 is connected to an auxiliary air brake cylinder 21 by means of a pipe 22. A vertical cylinder 23 is located within the casing and is threadedly secured to the upper end of the pipe. As the cylinder 23 is larger in diameterthan the pipe 20, the upper end of the pipe forms a seat-24 for a head-25. A stem 26 is secured to and rises vertically :fromthe head I 25, and the upper end thereof is disposed forlengagement withithe latch 10. A-suitably constructed valve 22 is mounted in the pipe :22 to control the admission of compressed vair .to the cylinder 23. ,Air entering the cylinder .23 .will :move the head 2-5 upwardly, such upward movement of the head moving the latch 10 into inactiveor idoorireleasing;;position. WVhen the aair ,pres

sure is cut oft-the head ,25 gravitates on to the .seat124: thus ;permitting thealatch to be returned to and yieldi-r gly ,held in ,-itsi activel or door securing position byameans of the spring "12. The head ,25 isguided in its movements .by means of :a bar 27 which .is securedracrossathe cylinder':23 and through whichpasses the stem 26.

.An audible indicator which'is preferably in theform of awhistlefl28, iis used-inconnection with our improved lock. The

whistle 28.,isicarried by a pipe .29swhich isconneoted with the pipe .22 by rmeansof a coupling v80. NVhen the valvet-is-turned to permitflthe flow of compressed ;air to the cylin.der:.23, a suflicient quantity of air will a pass through the pipe .29 -=.to 'sound the,

whistle. The sounding. ,of the whistlewi-ll be mwarning *to the ,propempersons ithat the door has been unlocked. The modification of thelock disclosed in Fig.3 resides in carrying athe apertured end wall of the keeper .1 6 a considerable distaneefbeyondtlie vertical edge .of the door, thuspermitting @thelockicasing to besitua-ted asdistanee from the door opening sufiicient to prevent injury to the lock during the loading or unloading of the car.

-It should be apparent from the above description, taken in connection with the accompanying drawing, that we provide a'car door lock which is simple, durable and eflicient, which will automatically secure a door in closed pos1t1on,'and which may be used in connection with any construction of sliding door. It should also be apparent that we provide a lock which will sound an alarm when the door is opened, and that it cannot be opened except by the use of compressed air derived from the auxiliary cylinder of the air brake system of; the car.

.Changes in the form, proportions, and minor details l of construction may be made within the scope of the claim withoutdeparting from the spirit or sacrificing any of the advantages of the invention.

:Havingthns described the invention, what is claimed as new is A lookcomprising =a-casing, a cylinder located in thecasing a Iatch piNQtaU-y mount ed .inthe. casing ,above'fihe cylinder, a head the whistle is sounded.

In testimony whereof we afiix our signatures, in presence of two "WItIIQSSGS.

WVAIJTER A. BYRNE. JAMES .WISE. Witnesses JOHN vREN HAN, JOHN BYRNE.

Copies of thispatentmaybe.ohtained'for .five cents each, by addressing the Commissioner of .I'atents, @Washington; D. C. 

